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    It depends on exactly what you want to use in the...

    It depends on exactly what you want to use in the prop shield.

    With the exception of the back row of pins, all of the pins of the prop shields mate directly onto the 28 outer row pins on the...
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    Yes, pololu is a good place (IMHO). They...

    Yes, pololu is a good place (IMHO). They specialize in robot parts. My usual purchases include:

    Voltage converters (mostly step up/step down):...
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    Two things. There are various bi-directional...

    Two things.

    There are various bi-directional level shifters out there made to convert 3.3v to 5v for I2C. The pololu one is the one I typically have used in the past:

    Pololu:...
  4. TOSlink part is obsolete at digikey.com

    I decided to build a S/PDIF setup, using the following parts (I haven't received these parts yet):

    Paul's OSHpark PCB for the TOSlink: https://oshpark.com/shared_projects/KcDBKHta
    Digikey...
  5. Yes it can be done with the Teensy, though there...

    Yes it can be done with the Teensy, though there are some things you may need to consider.

    Since the Teensy 3.6 has 51 digital pins, you could just hook up each LED to a digital pin and a...
  6. I posted an example of how to use the MAX98357A...

    I posted an example of how to use the MAX98357A in this thread that I created:

    Thread:...
  7. It looks like it went into Teensydunio 1.52 that...

    It looks like it went into Teensydunio 1.52 that was just released. Fortunately, Paul is now working on improving the documentation, so hopefully things will be better soon.
  8. Most pins, not all pins. It looks like on the...

    Most pins, not all pins. It looks like on the Teensy 4.1, there are 15 pins that are not PWM capable (16, 17, 20, 21, 26, 27, 30, 31, 32, 34, 35, 38, 39, 40, and 41 in the outer row pins). In...
  9. I did have a thought experiment, wondering...

    I did have a thought experiment, wondering besides USB/ethernet what would be the most sound outputs/inputs you could put on a Teensy 4.1, while still using the SPI ports, etc. My thought is:


    ...
  10. One other possibility is that you could stick...

    One other possibility is that you could stick something on the I2C bus (MCP23008, MCP23017) that can bring out one or more pins to use as hardware reset pins. It isn't like that would be performance...
  11. You didn't mention which Teensy you have. The...

    You didn't mention which Teensy you have. The simplest way is to look at the pinout card that came with your Teensy, or:

    https://www.pjrc.com/teensy/pinout.html


    And find the digital pins...
  12. Sorry about that. They changed around the...

    Sorry about that. They changed around the quantity and such. Here is an updated link for the English speakers:

    ...
  13. If we are listing DACs, we might want to list...

    If we are listing DACs, we might want to list chips/boards that act as DACs, but have no ways to control them like we have with the SGTL5000. In particular, I've used boards with the MAX98357 and...
  14. If you don't use the main SPI bus, using MQS...

    If you don't use the main SPI bus, using MQS (pins 10 and 12) might be a possibility. At least with the Teensy 4.1, you don't have to solder to the underneath pads to get access to the second SPI...
  15. I'm just glancing at it right now. Note, all of...

    I'm just glancing at it right now. Note, all of these are suggestions. If it is not worth the return on investment, feel free to drop stuff.

    I'm beginning to wonder it if would be better to have...
  16. That last line is wrong for the 3.2. The Teensy...

    That last line is wrong for the 3.2. The Teensy 3.2 only has one DAC, so you should use AudioOutputAnalog instead of AudioOutputAnalogStereo. You can only use AudioOutputAnalogStereo on the Teensy...
  17. IIRC, the first 2 serial ports on the Teensy 3.6...

    IIRC, the first 2 serial ports on the Teensy 3.6 (Serial1 on 0/1, Serial2 on 9/10) have 8 byte hardware FIFO (first-in, first-out) hardware queues, so they are less likely to lose data if interrupts...
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    This board mentioned in the product listing that...

    This board mentioned in the product listing that you can order from Oshpark:

    OSHpark PCB for setting up the board: https://oshpark.com/shared_projects/TG395I75
    Display at PJRC.COM:...
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    At least in the past you needed to define TwoWire...

    At least in the past you needed to define TwoWire also:


    typedef i2c_t3 TwoWire;



    https://forum.pjrc.com/threads/21680-New-I2C-library-for-Teensy3?p=80340&viewfull=1#post80340
  20. Hmmm, I found this link from Paul in 2015...

    Hmmm, I found this link from Paul in 2015 mentioning your work:

    https://dorkbotpdx.org/blog/paul/teensy_audio_library_gets_spdif_support/


    Lets see, there is:

    ...
  21. You don't need the master to have a separate uart...

    You don't need the master to have a separate uart to talk to each slave. Just have a protocol where the first byte/half-word/word or so of the message says which slaves to talk to. The slaves will...
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    The library was created for the original Teensy...

    The library was created for the original Teensy 3.0. The Teensy 3.0 was originally released in October 2012. So yes, with the introduction of the Teensy 4, things have gotten messy. Some of the t3...
  23. I thought they were now working, but I did not...

    I thought they were now working, but I did not know for certain, since I haven't used them.

    Is there a simple setup that would allow using pins 14/15 on the Teensy 4.0/4.1 to play audio? My main...
  24. The Teensy 4.0 and 4.1 does not have internal...

    The Teensy 4.0 and 4.1 does not have internal DAC's. Sound output options include:

    Use the main digital I2S bus (which the revision D audio shield uses) -- either using the audio shield, or...
  25. You want to use pin 19 (A5) to connect to SCL,...

    You want to use pin 19 (A5) to connect to SCL, and pin 18 (A4) to connect to SDA.

    You may or may not need pull-up resistors on the I2C bus (it depends on whether the device already has it own...
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    On Teensy 4.0/4.1, it isn't reset, but on/off. ...

    On Teensy 4.0/4.1, it isn't reset, but on/off. See my post above. On the Teensy 3.0, 3.5, and 3.6 it was reset. On the Teensy 3.1, 3.2, and LC it is the DAC (A14 or A12) that you can use to play...
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    These are pins that are on the back or adjacent...

    These are pins that are on the back or adjacent to the SD card on other Teensies. In particular, look at the back of the Teensy 4.0. Those 5 pins are the same on 4.1, except they are in a different...
  28. I suspect the 3.3v is the output of the 3.3v...

    I suspect the 3.3v is the output of the 3.3v voltage regulator on the pcb. I.e. the PCM5102a runs at either 1.8v or 3.3v (max of 3.9v). So the pcb adds a voltage regulator to reduce the 5v down to...
  29. Feel free to update the wiki.

    Feel free to update the wiki.
  30. I've powered LCs with various things. I do...

    I've powered LCs with various things.

    I do have some USB battery chargers that do not drop the power on low loads.

    A lot of times, I'm powering WS2812B (neopixel) LEDs, so that is usually...
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    Also I imagine it would be very useful to use the...

    Also I imagine it would be very useful to use the flash memory (if soldered in) and/or the micro SD cards on the Teensy 4.1.
  32. Are there other stores that sell the psram chips?

    I was updating the unofficial wiki (https://github.com/TeensyUser/doc/wiki/Flash-Memory) on Flash and psram memory, and I added a section for psram sellers:


    Pjrc.com:...
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    Disconnect the i2c device, and unplug the Teensy....

    Disconnect the i2c device, and unplug the Teensy. Then turn on the Teensy then press the program button for exactly 15 seconds. It should put a basic blink program into the Teensy. Note, it takes...
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    If you meaning running some variant of Linux on...

    If you meaning running some variant of Linux on the T4.x, I doubt it. I would wonder if the T4's memory support is robust enough for what typical Linux wants in an OS, and the 2M flash memory in the...
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    As I understand it, the SPI is not the same. I...

    As I understand it, the SPI is not the same. I was asking a similar question before and the answer was it uses FlexSPI rather than the normal SPI (LPSPI). I believe the necessary pins are not...
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    Glad it was helpful.

    Glad it was helpful.
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    On the beta board I received, the ground pin...

    On the beta board I received, the ground pin between VIN and 3.3v was not connected. Similarly, the ground pin between pins 13 and 41 was not connected. The ground pin next to pin 0 and the ground...
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    To amplify what manitou said, you cannot use this...

    To amplify what manitou said, you cannot use this in a pre-processor statement. It is a run-time variable that is set by the startup code to the size of the psram chips that are soldered on the...
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    Sure in a bit.

    Sure in a bit.
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    Here is an annotated back image of the Teensy...

    Here is an annotated back image of the Teensy 4.1:

    http://www.the-meissners.org/2020-small-albums/2020-electronics/small/2020-05-16-16-04-002-teensy.jpg
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    https://forum.pjrc.com/teensy41_2.jpg On the...

    https://forum.pjrc.com/teensy41_2.jpg

    On the bottom psram pads, between outer pins 32 and 30, the bottom 4 pads are, going left to right are:

    Pad 48 (CS pin)
    Pad 49
    Pad 50
    Ground
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    I thought KurtE's spreadsheet had a picture of...

    I thought KurtE's spreadsheet had a picture of the bottom part of the Teensy 4.1, but he right now only has a picture of the top. He does list the pads.

    ...
  43. I believe the original Adafruit neopixels used...

    I believe the original Adafruit neopixels used the WS2812's, then moved to the WS2812B's, and now they generally use SK6812's.

    Here are two pages that I've seen that compare them:

    WS2812 vs....
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    Here is a site with general information about...

    Here is a site with general information about cache memory in general that I found with a google search:

    https://searchstorage.techtarget.com/definition/cache-memory


    The Teensy 4.0 page has...
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    Vbat is the pin you connect the positive lead...

    Vbat is the pin you connect the positive lead from a coin battery (you connect the negative lead to ground). With the coin battery, the real time clock will be powered when there is no power to the...
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    Frank B wrote it: ...

    Frank B wrote it:

    https://github.com/FrankBoesing/T4_PowerButton.git
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    Yes, the _r stuff is for re-entrant code, but I...

    Yes, the _r stuff is for re-entrant code, but I didn't know if we could use the framework for separate heaps. I would imagine however, when the dual-core Teensy comes out that Paul has talked about,...
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    Malloc implementations for psram

    Rather than continue the discussions about adding a malloc layer for the psram memory on the Teensy 4.1 beta thread, it is probably better to open a new thread about it.

    Here are some open source...
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    Great! It will be good to get the official...

    Great! It will be good to get the official documentation updated. Besides adding 4.0 and 4.1 stuff, it may be time to more clearly segregate the Teensy 2.x information. I assume, you have plenty...
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    It is similar to functions. An extern variable...

    It is similar to functions. An extern variable declared weak is normally treated as an external reference. I.e. the definition of the variable must be in some other module.

    However, if the...
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